Guide for band-saws.



1 ate nted Dec. 23, I902. '6. RYAN. GUIDE FOR BAND SAWS.

(Application filed Sept. 10, 1962A Witnesses.

d Inventor. v v

UNITED STATES PATENT OFF CE.

CHARLES RYAN, or eLAsc'ow, SCOTLAND.

cur os FOR BAND-SAWS.

SPECIFICATION forming part of Letters Iatent No. 716,763, dated December 23, 1902.

7 Application filed September 10, 1902. Serial No. 1 22,766. (No model.)

1'0 ctZZ whom, it may concern:

Be it known that I, CHARLES RYAN, sawmiller, of St. Rollox Saw Mills, residing at 20 Baird street, Glasgow, Scotland, a subject of the King of Great Britain, have invented a certain new and useful Improved Guide for BandSaws, of which the following is a specification. V

This invention relates to the guides of bandsaws; and it has for its object to improve their construction.

The main feature of the invention is the use of a series of balls against which the back of the band works.

The guide, which maybe otherwise of the usual construction, is made with a groove or guideway or race,in which a series of balls are placed and arranged in such manner that the band as it works bears at its back against the balls or a number of them. If so desired, the guide-race for the balls maybe in the form of a flattened ellipse. The guide-race may be undercut, so as to retain the balls in position, and a gateway may be provided at the top for the insertion of the balls. The usual packing-strips may be secured to the guide by means of bent metal clamps and screws.

In order that the invention may be clearly understood, I have hereunto appended an explanatory sheet of drawings, whereon Figure l is a side elevation of the guide. Fig. 2 is a front elevation of the same. Fig. 3 is a cross-section. Fig. 4 shows the guide with its packing-strips removed. Fig. 5 is a plan, and Fig. 6 a front view, of a packingstrip.

a is the guide-supporting bracket of the band-saw machine, I) the band-saw, and c the guide. r

The guide is made of solid metal with a vertical groove ol for the band-saw and a groove 2 or race of flattened elliptical form for a series' of balls f. The groove has a narrow slit or opening at the front, through which the balls can be seen when the packing-strips are removed, as shown at Fig. 4. This slit is sufficiently narrow to prevent the balls falling out of place, and'at one side it coincides with and forms a part. of the vertical groove d, along which the back of the band-saw works. The band-saw as it moves bears at its back against the balls in the vertical groove and rubs on them. The balls, which are inserted into the ball-groove by the gate at Fig. 2.

.groove under the action of the band-saw.

The wood packing-strips it t' are each made,

as shown at Figs. 5 and 6, with a ledgej, and

the right-hand strip is also made with a part k, which is cut away sufficiently to expose a few of the balls in the ball-groove, as shown This exposed part of the ballgroove serves for the escape of sawdust as the balls move around and also for filling in lubricating oil (or cleansing oil, paraflin) when necessary. The packing-strips are socured to'the guide by the bent clamps Z m and thumb-screws 12.. These screws n pinch against the backing-plate o of the guide.

Having now fully described my invention, what I claim, and desire to secure by Letters Patent, is

l. The combination of a band-saw guide and a series of balls therein on which the back of the band-saw can work. a

2. The combination of a band-saw guide, a groove made in the guide and a series of balls inserted in the groove for the backof the band-saw to work against.

3. The combination of a band-saw guide, an elliptical groove made therein and a series of balls inserted in the groove for the back of the band-saw to work against.

4. The combination of a band-saw guide,

a groove made in the guide, a gate for the insertion of balls in the groove and a series of balls inserted in the groove for the back of the band-saw to work against.

5. The combination of a bandsaw guide, an elliptical groove made therein, a slit in the face of the groove and a series of balls inserted in the groove for the back of the band-saw to work against.

6. The combination of a band-saw guide, a series of balls therein on which the back of the band-saw can work,packiug-strips,clamps and screws, substantially as described.

7. The combination of a band-saw guide, a series of balls therein on which the back of the band-saw can work, packing-strips having ledges, a cut-away part on one strip, clamps, and screws, substantially as described.

Signed at Glasgow, Scotland, this 7th day of August, 1902.

CHARLES RYAN. Witnesses:

WILLIAM GALL, H. D. FITZPATRICK.

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